Revert "fix: Using custom DRF handler only in prod"
Revert "fix: Using custom DRF handler only in prod"

This reverts commit 9a86f8fd866e693267592c502bb9a9ff70ea6b64. See note at https://github.com/stencila/hub/pull/384#issuecomment-617420132
stencila/hub,stencila/hub,stencila/hub,stencila/hub,stencila/hub